Yes, a rectangular sensor can be installed upstream or downstream of a circuit breaker.
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Part no will be LV429214 for NSX100/250/160 breakers Part no will be LV432457 for NSX400/650 Breaker
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No - 25A is the largest
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Yellow sticker indicates when line is connected to bottom side. Meaning when eschocen plate is removed easy to identify that line is bottom feed. So if you connect from top side, then remove yellow sticker.
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No - the highest current rating is 25A
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